index.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Fira sans', sans-serif;
}

.container{
    max-width: 1280px;
    height: 8vh;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

nav{
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 99;
    background-color: #212121;
    padding: 16px 32px;
    border-bottom: 3px solid #8c38ff;
}
h1{
    color: #fff;
    font-size: 28px;
    font-weight: 500;
    letter-spacing: 2px;
    border: 3px solid #fff;
    padding: 5px 9px;
}
h1:hover{
    color: crimson;
}
.hamburger{
    display: none;
    position: relative;
    z-index: 1;
    user-select: none;
    appearance: none;
    border: none;
    outline: none;
    background: none;
    cursor: pointer;
}
.hamburger span{
    display: block;
    width: 33px;
    height: 4px;
    margin-bottom: 5px;
    position: relative;
    background-color: whitesmoke;
    border-radius: 6px;
    z-index: 1;
    transform-origin: 0 0;
    transition: 0.4s;
}

.hamburger:hover span:nth-child(2) {
    transform: translateX(10px);
    background-color: #6f18e8;
}
.hamburger.is-active span:nth-child(1){
    transform: translate(0px, -2px) rotate(45deg);
}
.hamburger.is-active span:nth-child(3){
    transform: translate(-3px, 3px) rotate(-45deg);
}
.hamburger.is-active span:nth-child(2){
    opacity: 0;
    transform: translateX(15px);
}
.hamburger.is-active:hover span{
    background-color: #6f18e8;
}
.menu{
    display: flex;
    flex: 1 1 0%;
    justify-content: flex-end;
    margin: 0 -16px;
}

.menu a{
    color: #fff;
    margin: 0 16px;
    font-weight: 400;
    text-decoration: none;
    transition: 0.5s;
    padding: 8px 16px;
    border-radius: 99px;
}
.menu a.active{
    background-color: #6f18e8;
}
.menu a:hover{
    background-color: #6f18e8;
}

@media (max-width: 768px){
    .hamburger{
        display:block;
    }
    .menu{
        display: none;
    }
}
@media (max-width: 285px){
    nav h1{
        position: absolute;
        border: none;
        font-size: 15px;
        margin-left: 40px;
    }
}